Transcript

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>> I don't believe the polls anymore. I don't believe them.>> With poll after poll, showing Republican presidential candidate Donald Trump trailing rival Hillary Clinton both nationally and in key battleground states, Trump is taken to attacking the numbers.>> They are phony polls, put out by phony media.

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You see these phony polls.>> And some pollsters tell Reuters, he might have a point. Reuter's editor, Scott Malone.>> People simply don't respond to pollsters telephone calls in the way they once did. Several people that I spoke to who worked in polling for decades talk about then they started out, doing a poll whether they get their responses of 80% of the people that were called.

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Today, that response is rarely reaches 10% and that leaves a post pollsters with the challenge. That's taking their samples waiting the filements of a population to try to make up for people who are respondent to them.>> Blame this with almost half of American adults now ditching landlines and using cell phones exclusively, pollsters have a harder time getting answers.

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Law prohibits robo-calling mobile phones, so calling vast numbers of them is now much more expensive, and cell phone users are more app to simply screen and ignore numbers they don't recognize. The latest Reuters/Ipsos poll puts Trump five percentage points behind Clinton nationwide, in line with an average of recent surveys.

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But, could the polls be wrong, and Trump on the verge of a surprise victory? It's happened before.>> A series of high-profile polling failures over the past year, including the inability to predict British voters decision in June to leave the European Union or vote by Colombians earlier this month to reject the peace court ending of a war 50 year old civil war, have raised some questions as to whether Americans could be in a surprise come election day.

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>> In Britain, the polls likely impacted turnout those who felt assured UK would remain in the EU came out in fewer numbers. If Clinton's supporters grow complacent, the victory of which they may now feel assured could slip away.